地理科学 ›› 2003, Vol. 23 ›› Issue (4): 471-476.doi: 10.13249/j.cnki.sgs.2003.04.471

• 论文 • 上一篇    下一篇

珠江水体悬浮物颗粒有机碳稳定同位素组成及分布特征

魏秀国1,2,3, 沈承德1, 孙彦敏1, 易惟熙1   

  1. 1. 中国科学院广州地球化学研究所, 广东 广州 510640;
    2. 广东省生态环境与土壤研究所, 广东 广州 510650;
    3. 广东省农业环境综合治理重点实验室, 广东 广州 510650
  • 收稿日期:2002-09-05 修回日期:2002-11-20 出版日期:2003-07-20 发布日期:2003-07-20
  • 基金资助:
    国家自然科学基金(49973009、国家重点基础研究发展规划项目(G1999043401)、中国科学院知识创新项目(KZCX2-SW-118,KZCX2-108)、广东省自然科学基金(批准号:010503、20000899)项目.

Characteristic of the Organic Carbon-isotope Composition and Contribution of Suspended Matter in the Pearl River

WEI Xiu-Guo1,2,3, SHEN Cheng-De1, SUN Yan-Min1, YI Wei-Xi1   

  1. 1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, Guangdong 510640;
    2. Guangdong Institute of Eco-environment and Soil, Guangzhou, Guangdong 510650;
    3. Guangdong Laboratory of Integrated Control of Agro-environment, Guangzhou, Guangdong 510650
  • Received:2002-09-05 Revised:2002-11-20 Online:2003-07-20 Published:2003-07-20

摘要: 研究了珠江三干流西江、北江和东江水体中悬浮物颗粒有机碳稳定碳同位素的组成、分布以及季节变化特征。研究结果显示:可以根据C3、C4植物及悬浮物的δ13C值区分不同流域的植被覆盖状况;东江流域水土流失区以草地、农田为主,C4植物影响较大;北江水体中颗粒有机碳主要来源于森林覆盖区,同位素组成受C3植物影响较大;西江水体中颗粒有机碳同位素组成介于其间,同时受C3、C4植物影响,颗粒有机碳部分来源于森林覆盖土壤,部分来源于草地和农田。

Abstract: The paper studies the characteristic of the contribution and seasonal change of organic carbon isotope composition(δ13C) in the Pearl River. According to the δ13C value of C3, C4 plant and river suspended matter, we can discern the state of plant covered in different water and soil loss area. The water and soil loss area in the Dongjiang River basin was mainly grassland and cropland. The water and soil loss area in Beijiang River basin was lots of subtropical forests. The results indicated that we can discern the condition of plant covered in different basins. POC of Beijiang mainly originated from forest area and its carbon-isotope composition was affected by C3 plant. The carbon-isotope composition of Xijiang is between that of Beijiang and Dongjiang's. It indicated that the suspended matter was affected by C3 and C4 plant at the same time. And part of POC in Xijiang River originated from the soil covered by forest, some came from grassland and cultivated land.

中图分类号: 

  • P342